i hardly ever do my work the same day each month,its always left vague,iv found this to be best as then nobodys upset if its pelting down with rain // so usually i simply climb over any locked gates ,or use a pole with a snick on it to hook open the bolt or if too awkward i leave them a note to open it the following day . usually i collect the money the following month but i never leave it more than 2 months,in which case i call round in the evening to get us back on track.